NextGen DB-1 Manuel utilisateur
DB-1 DI-Boost Pedal Kit
(V1.0-2020)
INSTRUCTIONS
This DB-1 DI-Boost Pedal Kit by Next Gen Musical Ltd. is a boost pedal at its core that
can also be ade into a 70's style distortion pedal. It contains instructions for both
configurations, as well as so e advanced distortion odding discussion. It was originally
designed by To Free an of To Free an Audio Effects, a Canadian pedal aker.
BOOST CONFIGURATION
As a boost pedal, the level control is a clean control that can reduce volu e or add a
slight clean boost. The gain control increases the volu e significantly, and introduces a little
grit as it's turned up past 12 o'clock. We suggest running it with the level axed, and the gain
to taste for the a ount of boost you want.
Using an op-a p as the core of the circuit, the pedal can be powered by up to 18V.
The higher the voltage used to power the pedal, the ore clean volu e there is available
before it gets gritty. Note that when built in the "boost" configuration, this is NOT a high gain
pedal. Even with the gain axed out, it adds very little grit to the signal on its own. Boost
pedals are used to overdrive your a p's tubes, or to increase your level a bit for things like
solos.
DISTORTION CONFIGURATION
As a distortion pedal, it's very raw sounding with a lot of attack, si ilar in design to the
classic MXR Distortion+ and Ross Distortions. We have added an advanced odification and
experi entation section that describes how you can experi ent to find the perfect distortion.
Depending on your choice of co ponents, it can be anything fro a subtle distortion to a high
gain onster. See the distortion od section for details, if you're brave enough.
Page 1
TABLE OF CONTENTS
Page 3-4 Kit Contents
Page 4 Reco ended Tools
Page 5-6 PCB Soldering Tips
Page 7 PCB Co ponent Layout
Page 8-15 Pedal Asse bly Instructions
Page 8 - Written Instructions
Page 11 - PCB - Boost Configuration Photo Guide
Page 12 - PCB - Distortion Configuration Photo Guide
Page 13 - Enclosure Asse bly Photo Guide
Page 14 - 3PDT Footswitch Wiring
Page 15 - Finished Product Photo Exa ple
Page 16 Advanced Distortion Modding & Experi entation Discussion
Page 19 Sche atic
Page 20 Basic Troubleshooting
Page 2
KIT CONTENTS
MAIN CONTENTS
PCB's:
1x - Next Gen DIY Kits DB-1 PCB
Resistors:
1x - 100Ω 1/4W Metal Fil Resistor
2x - 1KΩ 1/4W Metal Fil Resistor
2x - 4.7KΩ 1/4W Metal Fil Resistor
3x - 100KΩ 1/4W Metal Fil Resistor
3x - 2.2MΩ 1/4W Metal Fil Resistor
Capacitors:
2x - 0.1uF Polyester Fil Box Capacitor (25V ini u )
4x - 4.7uF Electrolytic Capacitor (radial lead; 25V ini u )
1x - 47uF Electrolytic Capacitor (radial lead; 25V ini u )
1x - 100uF Electrolytic Capacitor (radial lead; 25V ini u )
Diodes:
1x - 1N5817
1x - 5 LED (red)
ICs:
1x - TL072
1x - IC Socket
Potentio eters:
2x - A100K Alpha Mini Solid Shaft Pot (Right Angle PCB)
Jacks & Switches:
1x - Switchcraft #11 Mono Jack
1x - Switchcraft #12B Stereo Jack
1x - Pre iu 3PDT Footswitch
1x - Pre iu External DC Jack (2.1 )
Hardware & Wire:
1x - Ha ond 1590N1 Enclosure
1x - 9V Battery Clip (holder)
1x - 9V Battery Snap
1x - 5 LED Bezel
2x - Knobs for Pots
1x - Bundle of hookup wire (2' black; 2' red, 2' green, and 2' blue)
1x - Set of Adhesive Rubber Feet
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*ADDITIONS FOR DISTORTION CONFIGURATION*:
1x - Capacitor - 47pF Cera ic Disk Capacitor (25V ini u )
1x - Capacitor - 470pF Cera ic Disk Capacitor (25V ini u )
1x - Capacitor - 4.7nF Polyester Fil Box Capacitor (25V ini u )
1x - Capacitor - 47nF Polyester Fil Box Capacitor (25V ini u )
1x - Capacitor - 1uF Electrolytic Capacitor (25V ini u )
2x - Capacitor - 2.2uF Electrolytic Capacitor (25V ini u )
4x - Diodes - 1N914
1x - Potentio eter - A250K Alpha Mini Solid Shaft Pot (Right Angle PCB)
2x - Resistor - 10KΩ 1/4W Metal Fil
1x - Resistor - 2.2KΩ 1/4W Metal Fil
1x - Resistor - 220Ω 1/4W Metal Fil
RECOMMENDED TOOLS
•Soldering iron
◦Preferably one that can reach and aintain 350°C (digitally controlled is ideal)
◦S all flat tip is preferred, but a pencil tip will also work
•Solder station (with a da p sponge and steel wool)
•Solder (flux/rosin core; 22 gauge or thinner)
◦63/37 "eutectic" solder is easiest to work with and provides excellent long ter
reliability, but 60/40 will also work
•Solder braid (or a de-soldering pu p)
•Wire stripper
•Needle nose pliers
•Wire cutter
•Adjustable wrench
•Electrical tape, or heat-shrink tubing and heat gun
•Phillips head screwdriver
•A digital ulti eter that can easure continuity, resistance, capacitance, and voltage.
•A clean, well organized work surface with plenty of ventilation
◦Solder fu es are very hazardous to your health. Avoid breathing in the fu es.
Page 4
PCB SOLDERING TIPS
These instructions assu e that you are already fa iliar with basic soldering technique
and aintenance. Wiring electronics can be tedious work. It's i portant to take your ti e
and follow good soldering procedures to ensure a solid joint at each connection. This not only
ensures long ter reliability for you to enjoy the fruits of your labour, but it helps avoid any
hours of potential frustration while trying to figure out why your pedal isn't working.
Assu ing your soldering iron is clean, well aintained, and that it's up to te perature
and pre-tinned; Follow these steps to ake a good solder joint ounting a co ponent onto a
PCB:
1. Bend the leads of the co ponent you're installing just outside the body of the part, not
at the body. This helps avoid potentially da aging the casing of the part you're
installing (this is especially i portant with diodes.)
2. Push the leads through the holes so they co e out the other side, and then bend the
outwards slightly so the co ponent can stay in place on its own.
3. Make the solder joint:
a) Touch the soldering iron to the pad on the PCB and the lead of the part you're
installing (at the sa e ti e) and hold for 2-4 seconds. This will heat up the pad
and the lead for the solder to flow easier.
*Always take care to avoid making contact with any solder joints already soldered to
the board. Doing so will cause a solder bridge between the two pads, which will
prevent the pedal from functioning correctly.*
Page 5
b) Flow so e solder onto the lead and pad (not directly to the soldering iron) and
continue holding the soldering iron in place for another 1-2 seconds. This allows
any re aining flux/rosin to burn off, and for the solder to flow through to the other
side of the pad.
*Do not hold the soldering iron in place for too long, as this may damage the
component or the PC .*
c) Re ove the soldering iron. The result should be a s all bead of solder with a
irror-like sheen that flows through to the other side of the PCB pad. The picture
shows a little ore flow-through than needed. You just want it flowing through to
the other side to ensure a strong and stable connection.
4. Clip off the re aining co ponent leads or excess wire. Keep it aside for PCB ju per
wire aterial.
5. Clean and re-tin the iron as needed. So e do this between every joint, which ay be
needed for a beginner who is taking a lot of ti e between joints.
Page 6
PCB COMPONENT LA OUT
Location Boost Distortion
C1 100uF Electrolytic 100uF Electrolytic
C2 0.1uF Polyester 0.1uF Polyester
C3 47 uF Electrolytic 47uF Electrolytic
C4 OMIT 470pF Ceramic
C5 0.1uF Polyester 47nF Polyester
C6 4.7uF Electrolytic 1uF Electrolytic
C7 OMIT 47pF Ceramic
C8 4.7uF Electrolytic 2.2uF Electrolytic
C9 OMIT 4.7nF Electrolytic
C10 4.7uF Electrolytic 4.7uF Polyester
C11 4.7uF Electrolytic 2.2uF Electrolytic
D1 1N5817 1N5817
D2 OMIT 1N914
D3 OMIT 1N914
D4 OMIT 1N914
D5 OMIT 1N914
GAIN A100KΩ Pot A250KΩ Pot
VOLUME A100KΩ Pot A100KΩ Pot
R1 100KΩ 100KΩ
R2 100KΩ 100KΩ
R3 4.7KΩ 4.7KΩ
R4 2.2MΩ 2.2MΩ
R5 1KΩ 10KΩ
R6 2.2MΩ 2.2MΩ
R7 1KΩ 2.2KΩ
R8 4.7KΩ 220Ω
R9 JUMPER WIRE 10KΩ
R10 2.2MΩ 2.2MΩ
R11 100Ω 100Ω
R12 100KΩ 100KΩ
IC1 IC SOCKET IC SOCKET
Page 7
ASSEMBL INSTRUCTIONS
The PCB:
1. Open the kit package and confir all contents are present as listed in the KIT
CONTENTS.
2. Be sure to start with a clean and well organized workstation that is static-free.
3. Asse bly of the PCB usually starts with the shortest co ponents and ends with the
tallest. This is for ease of asse bly. We reco end this order:
a) Resistors & Ju per Wires (ju per wires can be actual wire, a very low value
resistor, or the clipped off lead fro another co ponent used in place of a wire)
b) Diodes (be sure to place the in the proper orientation; the line on the co ponent
should be on the side of the line on the PCB)
c) IC Sockets (be sure to place the in the proper orientation; the gap and/or dot on
the socket should line up with the gap and/or dot on the PCB)
•IC's the selves are not generally soldered directly to the board as they are
highly susceptible to heat da age. Instead, an IC socket should be used. To
install the IC, carefully position the legs into the sockets with the correct
orientation, then apply flat even pressure to the top of the IC until it's all the way
down. You ay need to bend the legs inward slightly to get the to slide into
the socket initially.
d) Tri Pots (not in this kit/build)
e) Non-polarized Capacitors (Mylar, Fil Box, Cera ic, etc.)
f) Transistors (not in this kit/build)
g) Press-fit IC's into their respective sockets (be sure to place the in the proper
orientation; the gap/dot on the IC should be on the sa e side as the gap on the
socket)
Page 8
h) Electrolytic Capacitors (be sure to place the in the proper orientation; the longer
leg is typically the positive lead)
i) Potentio eters (you can break off and discard the extra little tab on the side of the
pot's body using a pair of pliers before installing)
4. Using the PCB COMPONENT LAYOUT as a guide, position and solder the proper
co ponents into place one at a ti e, following the SOLDERING TIPS provided. You
can follow along with the photo exa ples provided in the next section.
5. Once the PCB is fully populated, set it aside and proceed to the next stage.
The Enclosure:
1. In this order, ount the LED holder ( etal part only), DC jack, footswitch, and audio
jacks into the enclosure.
2. Wire up the footswitch and audio jacks for true bypass by cutting the appropriate length
of each colour wire, stripping the wire ends back by approxi ately 1/4", and hooking
the wire around each intended lug. DO NOT solder yet.
a) Test signal flow with your ulti eter. There should be continuity between the
hot/signal lugs of each jack. There should be continuity between the ground lugs of
each jack. There should be NO continuity between a hot/signal lug and a ground
lug. Upon a successful test of the bypass wiring, solder each of the prepared
connections.
3. Place the LED through the s all plastic support piece of the LED bezel. Bend both
legs and attach hookup wire to each lead. Red goes to the longer lead, black to the
shorter lead. Solder the wires into place on the LED and clip off the excess leads. You
ay choose to add electrical tape or heat-shrink to these joints.
4. Push the LED into place within the LED holder and solder the negative/black lead to
the designated lug on the PCB based on the picture provided. Solder all re aining
wires to the jacks and footswitch as per the pictures provided. Make sure each piece
of hookup wire is at least 2 inches long. Do not solder anything to the PCB yet.
a) Battery Snap = Black wire to Input Jack (sleeve lug). Red wire to DC Jack ( iddle
lug).
You can ignore the battery snap and battery clip if you don't plan to add battery
capability. attery is not included.
5. Grab the PCB and begin connecting the hookup wires fro the ounted hardware to
the appropriate pads on the board. Start with the DC jack and LED, then ove on to
the re aining wires on the footswitch.
a) DC Jack = Red wire to PCB(J1-DC). Black wire to PCB(J1-GND).
b) LED = Red wire to PCB(LED1-A).
c) 3PDT Footswitch Wires = Follow the diagra provided.
Page 9
6. Once everything is connected, you can then ount the PCB by sliding the pot shafts
through the holes in the enclosure and attaching the washers/nuts on the other side.
Just be careful to keep the loose wires out of the way of the pots.
7. You're done (hopefully)! Connect the appropriate power supply or 9V battery, then
plug in and test your pedal. If everything is connected correctly, it should function as
expected. The LED should go on when the pedal is on, and off when the pedal is off.
LEVEL should increase and decrease the volu e. GAIN will also i pact volu e, but
should also increase and decrease the a ount of "grit" introduced (especially in the
distortion configuration).
If you bought this kit with an unfinished enclosure, now would be a good ti e to re ove the
jacks, switch, and PCB to do any painting/finishing of the enclosure. Then re-asse ble, add
the adhesive rubber feet to the botto plate, congratulate yourself on a job well done, and
ROCK OUT!
If something is not functioning correctly, proceed to the ASIC TROU LESHOOTING
section.
Page 10
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